Lamp for vehicle headlights and the like



1.500312 L. G. WILLIAMS LAMP FOR VEHICLE HEADLIGHTS AND THE LIKE July 8 1924.

Filed Oct. 23 1923 Zea/w 6; 5

atented July 8, E924.

LEWIS GARFIELD 1 1 5. :2

"w? FOR VEHICLE HEADLIGHTS AND THE LIKE.

Application filed October 28, 1923. I Serial No. 870,318.

To all whom it may concern Be it known that I, LEWIS GARFIELD WILLIAMS, subject of the King of Great Britain, residing at Corsyrhelig, Godrergraig, Glamorganshire, South Wales, have invented new and useful Improvements in Lamps for Vehicle Headlights and the like; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object to obviate the dazzling efl'ect by headlights, more particularly those of motor vehicles.

According to my invention I provide a lamp bulb which is partiall' covered with opaque substance,- and wi a substance adapted to filter the light so as to prevent glare. In the preferre embodiment of my invention the opaque substance presents to the filament of the lamp a reflective silvered surface, and the filtering substance is a blue colour, or other eflicient red ray absorbing colour. T

The filter colour is at its densest at the nose or foremost portion of the lamp so so that in plan a substantially shield-shaped concave mirror is provided in the lower portion of the lamp which will reflect rays of light directed from the filament-downwards, upwards to the roof portion of the parabolic reflector of the lamp casing. Consequently the rays of light will be reflected outwardly and downwardl in an intensified form. To prevent glare a ead b the reflection of the portion of the para lic reflector immediately in rear of the lamp bulb, the rear portion of the lamp bulb is also preferably coated with a dense coloured blue or other suitable colour. Preferably the latter portion of colouring merges from its maximum density immediately in the rearmost portion of the bulb to an almost wholly transparent coating joining the colour on the nose of the lamp, i. e. that portion of the bulb which is not covered by the silvered substance and the colour substance at the nose is covered with a pigment preferably blue or green which diminishes in density from the rear of the bulb to the front. By

.is not directed directly ahead of the lamp above its axial line of sight, whereby pedestrians or drivers of other vehicles do not have their vision affected adversely by the lights of the headlamps.

To illustrate clearly the nature of the preferred embodiment of my invention I. have appended herewith a sheet of drawings illustrating same wherein:-'

1 Fig. 1 is m end view of the nose of the Fig. 2 is a side'view of the lamp.

.Fig. 3 is a bottom view of Figs. 1 and 2.

Fi re 4 is a view similar to Figure 2 showing the lamp operatively positioned with respect to a parabolic reflector.

Referring to the drawings a conventional v and almost standard form of headlamp bulb is shown and upon the half through which the light from the filament 1 would be directed downwards is provided a coating 2 of highly reflective substance having an opaque backing. This coating may be on the mside or outside of the bulb, and preferably it does not cover the whole of the lower half of thelamp bulb but is substantially of shield like configuration in plan very much as shown in the drawings.

To prevent glare ahead of the lamp, i. e. along the axial line of sight of the lamp, the nose or foremost art of the bulb is covered with a dense co cured pigment 3, of a suflicient area to obscure the filament from an observer in front of the lamp. The colour of this pigment is preferably blue or green in order to ensure a maximum absorption of red rays. To ensure that the rearmost portion of the parabolic reflector of the lamp does not reflect a dazzling white light directly ahead of the lamp, the rear portion of the bulb is also preferably coated with a coloured pigment 4, likewise preferably having blue or green for its base. This latter coating of material may extend in various gradations all over the portion of the. bulb not covered by the portions 2 and 3, but preferably it is densest at the rear or base portion of the lamp and gradually merges into an almost transparent coatiiig adjoining the portion 3, so that when the lamp is positioned in front of a parabolic reflector as shown in Figure 4, rays of light from the lamp will be excluded from that portion of the reflector which would direct them upward and are admitted only to the portion of the reflector which directs them downward. What I claim is A bulb for use with a parabolic reflector having a coating of an opaque substance upon one side wall thereof, and a coating of red ray absorbing substance upon its re- I maining surface, the latter coating having a maximum density at the base and nose of 15 the bulb and at the intermediate portion of said remaining surface decreasing in density from the base to the nose.

In witness whereof I have signed this specification in the presence of two wit- 20 neses.

LEWIS GARFIELD WILLIAMS.

Witnesses:

, A. S. MIOKLIN,

T. O. HUeHns. 

